What Is an XML File and How Can You Open and Use It?

Although Json (which you might have seen mention of in many places on Steem) is now the chief alternative for data integration , a knowledge of XML is still very useful.
You may have seen the term "XML." As a file extension or you might even have accidentally opened an XML file. What is XML and how do you use it?
An layman's guide to XML from those nice people at www.makeuseof.com

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